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as for your transfer case...I am not sure, but it could be a NP205. What is the shift pattern for it? if it says something like "hi" "hi lock" "lo" lo lock" then it is a NP203 full time transfer case, which is more common in 73 up 4x4s. But if it just has the standard shift pattern (4 lo, 4 hi, 2 hi) then its a NP205.
your transmission is the SM465. its RPO code is M20, but its totally different than the car version. it has the granny low first gear. the TH400 is an automatic transmission, you said you had a clutch pedal so I'm fairly certain you don't have this.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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